Mapping of Quantitative Trait Loci (QTLs) for seed weight in blackgram (Vigna mungo (L.) Hepper)

The present study was conducted to identify quantitative trait loci (QTLs) governing hundred seed weight in blackgram using 184 recombinant inbred lines derived from the inter-specific cross VBN (Bg) 5 and Vigna mungo var. silvestris 22/10. The RIL population developed through single seed descent method was grown in three different seasons and the mature dried seeds were taken for observing hundred seed weight. The analysis of variance revealed significant difference for genotype, environment and genotype × environment interaction suggesting the influence of environment over genotypes. In each of the three seasonsand in pooled data, one QTL (qhswk 1.1, qhswr 1.1, qhsws 1.1 and qhswp 1.1, respectively) was identified which was flanked by the unique markers CEDG 097 and CEDG 198 at LOD ranged from 3.00 to 3.36. The phenotypic variation ranged from 5.68 to 7.54 per cent. The QTL was found to be inconsistent across the seasons. Hence, this QTL could be used to study the interaction between QTL and environmental factors to identify environment-specific QTL. The identified QTL could be further utilized in the genetic enhancement of seed weight in blackgram by increasing the number of associated markers.